【摘要】 本文讨论基于非双曲时差公式的各向异性分析和参数提取方法,该公式是建立在VTI介质假设之上的各向异性旅行时公式,它可以更加精确地描述大排列上的地震波的旅行时特征。其主要思路是:首先利用数值模型资料验证了本文方法的可行性;然后将该方法应用于研究区实际3DVSP资料,在共检波点道集上通过炮点初至旅行时分析来研究各向异性特征,包括VTI各向异性和方位各向异性;最后,讨论了将等效各向异性参数转换成层内各向异性参数的方法,并应用模型和实际资料进行了试算。结果证实,该区地震资料存在较强的VTI各向异性和一定程度的方位各向异性。更多还原

【Abstract】 Anisotropy analysis and parameters extraction based on the nonhyperbolic moveout is discussed in this paper.The nonhyperbolic moveout,which is more accurate on long-spread,is derived under VTI hypothesis.The main idea is as follows: Firstly the feasibility of this method is demonstrated by synthetic data.Then,it is applied to a filed VSP data,where the anisotropy analysis including VTI and azimuth anisotropy is performed on 3D VSP common receiver gathers.Finally,extraction of interval anisotropy parameters from the effective parameters is discussed and tested on both model and field VSP data.As a result,the data in this area shows strong VTI and some azimuthal anisotropy.更多还原